# A152663 (b-file synthesized from sequence entry)
1 1
2 1
3 6
4 16
5 120
6 540
7 5040
8 32256
9 362880
10 3024000
11 39916800
12 410572800
13 6227020800
14 76281004800
15 1307674368000
16 18598035456000
17 355687428096000
18 5762136335155200
19 121645100408832000
20 2211729098342400000
21 51090942171709440000
22 1030334000462807040000